Modern technology has advanced the game of baseball in many ways. Teams use computer models to help strategize, data analytics to find the best players, and even tablets in the dugouts to instantly review plays. But the game itself can move at a leisurely pace — and some traditions may never change at all. Take Wrigley Field, home of the World Champion Chicago Cubs. Among the brick, ivy-covered outfield walls, the 103-year-old ballpark has new seating, dining and barroom areas, and a massive, new high-definition Jumbotron. And just to the right of that Jumbotron is a living relic: a manually-operated scoreboard. It's one of only two in Major League Baseball — the other is in Boston's Fenway Park. Wrigley Field's forest-green scoreboard sits atop...